diff --git a/src/components/views/voip/CallView.tsx b/src/components/views/voip/CallView.tsx
index 3a5dfcf068..db6d2b7ae0 100644
--- a/src/components/views/voip/CallView.tsx
+++ b/src/components/views/voip/CallView.tsx
@@ -390,7 +390,7 @@ export default class CallView extends React.Component<IProps, IState> {
         let fullScreenButton;
         if (this.state.call.type === CallType.Video && this.props.room) {
             fullScreenButton = <div className="mx_CallView_header_button mx_CallView_header_button_fullscreen"
-                onClick={this.onFullscreenClick} title={_t("Fill screen")}
+                onClick={this.onFullscreenClick} title={_t("Fill Screen")}
             />;
         }
 
diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index 25b186377a..14c0e0b156 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -780,7 +780,7 @@
     "This is your list of users/servers you have blocked - don't leave the room!": "This is your list of users/servers you have blocked - don't leave the room!",
     "Video Call": "Video Call",
     "Voice Call": "Voice Call",
-    "Fill screen": "Fill screen",
+    "Fill Screen": "Fill Screen",
     "Return to call": "Return to call",
     "Unknown caller": "Unknown caller",
     "Incoming voice call": "Incoming voice call",